EP2643559B1 - Intégration de chaleur dans la capture de co2 - Google Patents

Intégration de chaleur dans la capture de co2 Download PDF

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EP2643559B1
EP2643559B1 EP11771118.4A EP11771118A EP2643559B1 EP 2643559 B1 EP2643559 B1 EP 2643559B1 EP 11771118 A EP11771118 A EP 11771118A EP 2643559 B1 EP2643559 B1 EP 2643559B1
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water
pipe
steam
absorbent
withdrawn
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German (de)
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EP2643559A2 (fr
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Tor Christensen
Hermann De Meyer
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Co2 Capsol As
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1418—Recovery of products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1406—Multiple stage absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1412—Controlling the absorption process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1425—Regeneration of liquid absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1475—Removing carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
    • F22B1/1815—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines using the exhaust gases of gas-turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/306—Alkali metal compounds of potassium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/606—Carbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/32—Direct CO2 mitigation

Definitions

  • the present invention relates to the field of CO 2 capture from CO 2 containing gases, such as exhaust gases from combustion of carbonaceous fuels. More specifically, the Invention relates to improvements to CO 2 capture for reduction of energy requirement for a plant for CO 2 capture.
  • the technologies proposed for CO 2 capture may be categorized in three main groups:
  • WO 2004/001301 A (SARGAS AS) 31.12.2003, describes a plant where carbonaceous fuel is combusted under an elevated pressure, where the combustion gases are cooled inside the combustion chamber by generation of steam in steam tubes in the combustion chamber, and where CO 2 is separated from the combustion gas by absorption / desorption to give a lean combustion gas and CO 2 for deposition, and where the lean combustion gas thereafter is expanded over a gas turbine.
  • WO 2006/107209 A (SARGAS AS) 12.10.2006 describes a coal fired pressurized fluidized bed combustion plant including improvements in the fuel injection and exhaust gas pre-treatment.
  • Combustion of the carbonaceous fuel under elevated pressure and cooling of the pressurized combustion gases from the combustion chamber reduces the volume of the flue gas, relative to similar amounts of flue gas at atmospheric pressure. Additionally, the elevated pressure and cooling of the combustion process makes a substantially stoichiometric combustion possible.
  • a substantially stoichiometric combustion giving a residual content of oxygen of ⁇ 5% by volume, such as ⁇ 4% by volume or ⁇ 3% by volume reduces the mass flow of air required for a specified power production.
  • the elevated pressure in combination with the reduced mass flow of air results in a substantial reduction of the total volume of the exhaust gas to be treated. Additionally, this result in substantial increase in the concentration and partial pressure of CO 2 in the flue gas, greatly simplifying the apparatus and reducing the energy required to capture CO 2 .
  • WO 2010/020684 relates to a plant and method for removing or substantially reducing the amount of NOx and SOx in the exhaust gas from a marine diesel engine. Additionally, addition of a unit for CO 2 removal in such an installation is illustrated in figure 6 and the corresponding description. Scrubbers are provided to remove Impurities such as ammonia slip from a SCR unit, from the gas. Additionally, coolers are provided for cooling the washing solution in the scrubbers. The application is, however, silent on energy saving measures by transferring heat between the coolers and other processes in the plant.
  • WO 2009/035340 relates to a CO 2 capture unit for a power plant, where steam for reducing the reboiler duty is generated by flashing the lean absorbent withdrawn from the bottom of the stripper column.
  • the generated steam may additionally be compressed and additional water as condensate from a flash tank in the path for separating steam from CO 2 downstream of the stripping column, may be added.
  • washing water from a direct contact cooler at the top of the stripping column for generation of steam or further heating of said washing water
  • a heat exchanger for a direct contact cooler for the incoming exhaust gas to improve the energy efficiency of the CO 2 capture.
  • the aim of the present invention is to provide novel an improved solutions for heat integration for increasing the energy efficiency, i.e. maximise the output of useful energy as heat and / or electricity of a given amount of chemical energy as carbonaceous fuel.
  • a method for power production by combustion of carbonaceous fuels and CO 2 capture where the carbonaceous fuel is combusted in a combustion chamber under pressure in presence of gas containing oxygen, where the combustion gas is cooled in the combustion chamber by generation of steam inside heat pipes provided in the combustion chamber, where the exhaust gas is withdrawn from the combustion chamber through an exhaust gas pipe via heat exchanger(s) and exhaust gas treatment units , and a direct contact cooler connected to a water recycle pipe for recirculation of water collected at the bottom of the direct contact cooler and reintroduction of the water at the top of the cooler, in which cooler the partly cooled exhaust gas is further cooled and humidified by counter-current flow to water, where the exhaust gas is withdrawn from the direct contact cooler through a cleaned exhaust pipe and is Introduced into a CO 2 absorber, into which absorber lean absorbent is introduced above an upper contact zone In the absorber, to cause the exhaust gas to flow counter-current to a liquid CO 2 absorbent to give a rich absorbent that is collected at
  • FIG. 1 is an illustration of a plant according to the present invention.
  • Fuel which contains carbon herein also referred to as carbonaceous fuel, is introduced through a fuel pipe 1 into a pressurized combustion chamber 2 at a pressure from 5 to 50 bar gauge, hereinafter abbreviated as barg.
  • the pressure in the combustion chamber is preferably above 10 barg, such as e.g about 15 barg.
  • the fuel may be natural gas, oil, coal, biofuel or any other carbon rich fuel and the way of introduction and firing of the fuel is dependent on the type of fuel as Is well known by the skilled man in the art.
  • Air or a gas containing oxygen is Introduced through an air Intake 3 into a compressor 4.
  • the compressor 4 is driven by a motor 5 or a gas turbine 6 via a common shaft 25 as will be further described below.
  • the skilled man will understand that the compressor 4 may be a representation for one or more compressors or compressor stages connected in series, optionally with intercoolers between the individual compressors or compressor steps. Parallel compressors may be employed for very large systems.
  • the air or gas containing oxygen from compressor 4 is led through a compressed air pipe 7 into the combustion chamber 2 as a source for oxygen for the combustion in the combustion chamber.
  • the air and fuel introduced into the combustion chamber are controlled to give residual oxygen content in the exhaust gas lower than 5 % by volume, such as lower than 4 % by volume or lower than 3 % by volume.
  • Low residual oxygen content results in a flue gas with high CO 2 content. Accordingly, the CO 2 content in the exhaust gas is from about 8 % to about 18% by volume when air is used and the values for residual oxygen are as indicated.
  • Heat pipes 8, 8' are arranged inside the combustion chamber to cool the combustion gases by generation of steam and superheated steam inside the heat pipes 8, 8', respectively.
  • the combustion gases are cooled by the heat pipes 8, 8' so that the exit temperature of the exhaust gas is 300 to 900 deg C.
  • the internal arrangement in the combustion chamber may differ.
  • coal as fuel air is introduced to give a fluidized bed of fuel for the combustion and the heat pipes 8, 8' are arranged in the fluidized bed.
  • oil or gas as fuel two or more stages of oil burners or gas burners, respectively, are arranged in the combustion chamber and the heat pipes 8, 8' are arranged between the stages to cool the combustion gases between each stage.
  • the mentioned fuels or other carbon rich fuels are possible to use combination of the mentioned fuels or other carbon rich fuels.
  • WO 2004001301 and WO 2006107209 describe examples of configurations for different fuels.
  • Exhaust gas is withdrawn from the combustion chamber through an exhaust gas pipe 9 and is cooled in a heat exchanger 10 to a temperature between 250 and 450 deg C.
  • One or more units for exhaust gas pre-treatment is/are arranged downstream of the heat exchanger 10.
  • a filter unit 11 is arranged immediately downstream to the heat exchanger 10 to remove particles from the combustion gas.
  • the filter unit may be omitted for exhaust gas having low particle content, such as exhaust gas from combustion of oil or gas as fuel.
  • the filter unit is, however, obligatory when using coal as coal gives rise to particles that may be detrimental for steps downstream of the gas treatment unit.
  • a Selective Catalytic Reduction (SCR) unit 12 Is therefore arranged downstream of the heat exchanger 10 and the optional filter unit 11. Urea or NH 3 is introduced into the SCR unit and reacted with NOx over a catalyst for removal of NOx according to well known technology.
  • the temperature in the SCR unit is preferably between 250 and 450 deg C.
  • Preferred operation temperature for a SCR unit is about 350 deg C.
  • the first heat exchanger 13 is a flue gas cooling unit for cooling of the exhaust gas to below 250 deg C.
  • the second illustrated unit 14 may be a co-current scrubber. Depending on gas composition and operating conditions, the scrubber may also contribute to the cooling of the gas.
  • a counter-current scrubber or direct contact cooler 15 Downstream for the cooling units 13,14 a counter-current scrubber or direct contact cooler 15 is arranged downstream for the cooling units 13,14 . Cooling water is introduced through recirculation pipe 16 into the cooler 15 above a contact zone 15' and brought in counter-current flow to exhaust gas that is introduced into the cooler 15 below the contact zone. Water is collected at the bottom of the cooler 15, cooled in a heat exchanger 17 and recycled through the recirculation pipe 16.
  • the units 11, 12, 13, 14, and 15 may collectively be referred to as pre-treatment units as their purpose is to prepare the exhaust gas for CO 2 capture.
  • Cooled exhaust gas is withdrawn from the cooler 15 through a cleaned exhaust gas line 18 and is introduced into the lower part of an absorber column 19 where the exhaust gas is brought in counter-current flow with an absorbent in one or more contact zone(s) 19', 19", 19''' inside the absorber.
  • the absorbent a fluid which captures CO 2 and may subsequently be regenerated by applying low CO 2 partial pressure in the gas phase, relative to the partial pressure of CO 2 immediately above the fluid surface, is introduced into the absorber above the upper contact zone through a lean absorbent line 35.
  • CO 2 in the exhaust gas is absorbed by the absorbent inside the absorber to give a CO 2 laden, or rich, absorbent that is withdrawn form the bottom of the absorber through a rich absorbent line 30.
  • the pressure in the absorber Is slightly lower than the pressure in the combustion chamber, such as 0,5 to 1 bar lower than the pressure in the combustion chamber, which corresponds to a pressure in the absorber from 4.0 to 49.5 barg.
  • the absorbent used in the absorber is preferably based on a hot aqueous potassium carbonate solution.
  • the absorbent comprises from 15 to 35 % by weight of K 2 CO 3 dissolved in water.
  • Lean exhaust gas is withdrawn at the top of the absorber 19 through a lean exhaust gas line and is Introduced into a washing section 21 where the lean exhaust gas is brought in counter-current flow against washing water in a contact section 21' . Washing water collected at the bottom of the washing section through a washing water recycle line 22 and Is reintroduced into the washing section above the contact section 21'. Washed lean exhaust gas is withdrawn from the top of the washing section through a treated exhaust pipe 23.
  • the gas in the treated exhaust pipe 23 Is Introduced into the heat exchanger 10 where the treated exhaust gas Is heated against the hot, untreated exhaust gas leaving the combustion chamber 2.
  • the thus heated and treated exhaust gas is then introduced Into a gas turbine 6 where the gas is expanded to produce electrical power in a generator 24. Expanded gas is withdrawn through an expanded exhaust gas pipe 26 which is cooled in a heat exchanger 27 before the as is released into the atmosphere through exhaust gas exit 28.
  • the compressor 4 and gas turbine 6 may be arranged on a common shaft 25 so that the compressor 4 is at least partly operated by the rotational energy from the gas turbine 6. It is, however, presently preferred that the compressor Is operated by the electrical motor 5, and that the gas turbine operates the generator 24 to provide electrical power. Separation of the compressor 4 and gas turbine 6 gives more flexibility In the operation of the plant.
  • Rich absorbent i.e. absorbent laden with CO 2 is collected at the bottom of the absorber 19 and is withdrawn there from through a rich absorbent pipe 30.
  • the rich absorbent In pipe 30 is flashed over a flash valve 31 to a pressure slightly above 1 to bar absolute, such as 1.2 bar absolute, hereinafter abbreviated bara, before being introduced into a stripping column 32.
  • bar absolute such as 1.2 bar absolute
  • One or more contact section(s) 32', 32", 32''' is/are arranged In the stripping column 32.
  • the rich absorbent Is introduced above the upper contact section of the stripper, and counter-current to vapour introduced below the lowest contact section.
  • Low partial pressure of CO 2 in the stripper which is the result of lower pressure and dilution of CO 2 in the stripper, causes the equilibrium in the equation (1) above to be shifted towards left and CO 2 to be released from the absorbent.
  • Lean absorbent is collected at the bottom of the stripping column 32 and is withdrawn through a lean absorbent pipe 33.
  • the lean absorbent pipe 33 is split in two, a first lean absorbent reboiler pipe 34 that is heated in a reboiler 36 to create evaporation from the liquid which is Introduced as stripping gas into the stripping column through a steam line 37, and a lean absorbent recycle line 35 in which lean absorbent is pumped back into the absorber 19.
  • a pump 38 and a cooler 39 are provided in line 35 to pump and thus increase the pressure of the absorbent, and to cool the absorbent, respectively, before the absorbent is introduced into the absorber.
  • CO 2 and steam are collected at the top of the stripping column through a CO 2 withdrawal pipe 40.
  • a desorber direct contact cooler 66 is arranged above the contact zones 32', 32", 32" and above the point where the rich absorbent is introduced into the stripper column 32 through pipe 30 to cool the vapour and CO2 gas mixture leaving the upper contact zone. Cooling fluid is introduced above the direct contact cooler section and allowed to flow through the direct contact cooler section 66.
  • a collector plate 65 is arranged below the direct cooler contact section to allow vapour to pass through on the way upwards in the stripping column 32, and to prevent the cooling fluid from flowing into the contact zones 32', 32", 32'''. Fluid collected at the collector plate 65 is withdrawn through a water recycle pipe 70 and used as described below.
  • the vapour in pipe 40 is cooled in a cooler 41 and Introduced Into a flash tank 42. Liquid formed by cooling in cooler 41 is collected in the bottom of the flash tank 42 through a liquid return pipe 43 and is introduced into the stripping column 32. Alternatively, not shown in Figure 1 , the liquid may be routed to the top of the absorber column 19.
  • a liquid balance pipe 44 may be provided to add liquid to pipe 43, or remove liquid from pipe 43 to balance the circulating amount of water.
  • the gaseous phase in the flash tank 42 is withdrawn trough a CO 2 withdrawal pipe 45, Is compressed by means of a compressor 47 and is cooled in a heat exchanger 48 before the gas is further treated to give dry and compressed CO 2 that is exported through a CO 2 export pipe 46.
  • the cooling fluid collected at the collector plate 65 and withdrawn through pipe 70 is introduced into the above mentioned heat exchanger 17 to cool the recycling cooling water in recirculation pipe 16.
  • a pump 71 could be arranged preferably in line 70 to circulate the water.
  • the heated fluid is withdrawn from heat exchanger 17 through a pipe 70' and is introduced Into the above identified heat exchanger 48 to be further heated against compressed CO 2 and steam therein. Further heated fluid is then withdrawn from the heat exchanger 48 through a water pipe 72, is flashed over a flash valve 73 before the flashed fluid is introduced into a flash tank 74 to give water that is collected at the bottom thereof, and vapour that is collected at the top of the flash tank 74 and is withdrawn through a vapour pipe 77.
  • a compressor 75 is arranged In the vapour pipe 77, followed by an optional trim cooler 76.
  • the vapour in vapour line 77 is then introduced as stripping vapour through line 37 into the stripping column 32.
  • the fluid in line 70 may be routed directly to flash valve 73, or may be heated in low temperature energy sources additional to or other than heat exchangers 17 and 48. Examples of such heat sources are scrubber 14, compressor 4 intercoolers, or residual heat In lines 26 and/or 28. More heat reduces power requirements in compressor 75 and may increase the overall system thermal efficiency.
  • the liquid from flash tank 74 is withdrawn through line 78 and introduced as washing liquid into the stripping column direct contact cooler through pipe 43.
  • a pump 79 is preferably arranged in line 78 to provide sufficient pressure therefore.
  • Cooling water for the combustion chamber is introduced into the heat pipe 8 from a water pipe 50.
  • Steam generated in the heat pipe 8 is withdrawn through a steam pipe 51 and is expanded over a high pressure steam turbine 52.
  • the steam from the high pressure turbine section Is introduced through line 63 into the steam reheater 8' and the resulting steam is withdrawn through steam pipe 54.
  • the superheated steam In pipe 54 is expanded over the intermediate and low pressure sections of the steam turbine 55.
  • the first 52 and second 55 steam turbine sections are preferably arranged on a common shaft 80 together with a generator 81 for generation of electrical power.
  • the steam cycle and optimization thereof is well known for people skilled In the art.
  • the partly expanded steam in pipe 59 is introduced into a humidifier where the steam Is cooled by means of water spray Introduced from a water pipe 61.
  • the cooled steam is withdrawn from the humidifier 60 through a reboiler steam pipe 62 and is used for indirect heating of lean absorbent In the reboller 36 to produce vapour from the lean absorbent.
  • Water from condensation of steam introduced Into reboiler 36 through pipe 62 is withdrawn through a condensate line 63 and is introduced into the tank 58.
  • contact sections 15', 15", 15''', 19', 19", 19''', 21', 21", 21''', 32', 32", 32'' are contact sections preferably comprising a structured and/or unstructured packing to increase the internal surface area and thus the contact area between liquid and gas In the contact sections.
  • Figure 2 illustrates a specific embodiment of the present invention giving even higher energy efficiency than the embodiment described with reference to figure 1 .
  • the only difference between the embodiment of figure 2 compared with figure 1 relates to flashing of lean absorbent as will be described below. Flashing of lean absorbent as a means for improving energy efficiency is well know per se but not in connection with the heat conservation features as described with reference to figure 1 .
  • the part of the lean absorbent leaving the stripper column through line 33 that is to be returned to the absorber 19, is introduced into a flashing valve 90 and then released Into a flash tank 91.
  • the gas phase in the flash tank 91 Is withdrawn through a steam line 92 and compressed by means of a vapour compressor 93 to compress and thereby heat the vapour.
  • the compressed and heated vapour Is then introduced as stripping gas into the stripping column through a compressed steam line 94.
  • the liquid phase collected at the bottom of the flash tank 92 is withdrawn therefrom and pumped into the lean absorbent line 35 by means of a pump 95.
  • cooler 39 is not used.
  • the absorber is typically operated at 80 to 110 deg C, whereas the desorber (stripper) is operated at 90 to 120 deg C dependent on the pressure, typically the temperature in the desorber is 92 deg C in the top, and 110 deg C in the bottom due to higher pressure and higher concentration of K 2 CO 3 .
  • coal is fed together with SOx sorbent and typically 25% water to form a paste that Is injected into the fluidized bed of the combustion chamber.
  • SOx sorbent typically 25% water
  • HHV 282 MW higher heating value
  • the expanded steam is reheated to about 565 deg C at about 40 bara in heat tube 8' and is expanded over steam turbine 55.
  • steam turbine 55 typically, about 18 kg/s steam Is withdrawn from the steam turbine stages at various pressures and used for boiler pre-heating. This is not shown in figure 1 and 2 for clarity.
  • the steam is withdrawn from the steam turbine in line 59 at about 4 bara. The amount of such withdrawal should be minimized. Based on this, the amount of steam that is fully expanded over the steam turbine Is 86 kg/s minus about 18 kg/s minus steam flow in line 59. This corresponds to 68 kg/s minus any steam in line 59.
  • the fully expanded steam Is withdrawn from turbine 55 through line 56 and recycled as boiler feed water Into the heat tube 8, whereas some 12 kg/s steam is partly expanded and withdrawn through pipe 59,
  • the steam withdrawn through pipe 59 has typically a temperature of about 258 deg C and a pressure of 4 bara, but the temperature and pressure may vary depending on the steam turbine system.
  • This steam is cooled In the humidifier 60 to give steam at about 4 bara and 144 deg C that is introduced into the reboiler of the desorber 36 for indirect heating to produce vapour therein.
  • the steam withdrawn through line 59 at 4 bara and 258 deg C could alternatively be expanded to about 0.035 bara at about 27 deg C, to give about 0.7 MJ electrical power per kg expanded steam, assuming steam turbine adiabatic efficiency of 90%.
  • the steam flow from the 4 bara stage to the condenser is about 68 kg/sec, if the flow in line 59 is zero.
  • the combustor produces about 24.5 kg/s CO 2 , of which about 22 kg/s Is captured (90% capture).
  • the latent heat required to run the desorber is 3.6 MJ/kg CO 2 captured, about 80 MW latent heat is required.
  • the heat content of the 4 bara and 258 deg C steam, when cooled to saturation temperature at 4 bara and the condensed at 4 bara, is about 2.4 MJ/kg.
  • the required amount of steam from the steam turbine is therefore about 80/2.4 kg/s, or about 34 kg/s.
  • the loss of power from the steam turbine is then 34 * 0.7 MW or about 24 MW.
  • the pressure is slightly above atmospheric. Therefore, the product produced from the steam extracted from the steam turbine is now steam at, for example 1.2 bara at a temperature of about 110 deg C which is the boiling point of the lean absorbent at this pressure.
  • the energy required is 3.6 MJ / kg CO 2 or about 80 MW latent and sensible heat. This corresponds to about 34 kg/h steam flow to the bottom of the desorber, produced in the reboiler.
  • this steam is condensed to obtain the CO 2 , and the latent heat of the stripping steam is therefore lost, which is a much larger loss than the loss associated with the reduction in partial pressure of the stripping steam by dilution with recovered CO 2 . It Is desirable to preserve this latent heat, and only supply energy to compensate for the loss of stripping steam partial pressure.
  • recoverable heat in the range 80 to 90 deg C amounts to about 28 MW that may be recovered from the desorber direct contact cooler section 66 in the washing water withdrawn through pipe 70.
  • the heat energy recovered in the desorber direct contact cooler 66 is an important source for recovering heat In the present process.
  • the CO 2 / steam to be withdrawn from the desorber / stripper is cooled by direct contact cooling against water. Due to the cooling, steam in the steam saturated gas is condensed, and thus separating water vapour from the desired product which is CO 2 .
  • the water vapour saturation temperature depends on the amount of water vapour and on the pressure. With coal fuel fed into the combustor as paste and pressure about 12 to 13 bara, the flue gas saturation temperature is about 115 deg C. If natural gas fuel Is used, the amount of water vapour is higher and the saturation temperature will be higher. If the pressure is lower, the saturation temperature will be lower.
  • FIG. 4 is an illustration on the effect of pressure on the amount of high temperature recoverable heat when flue gas is cooled. The curve is made under the assumptions of a flue gas flow of 111 kg/s where the flue gas inlet temperature of 115 deg C, and flue gas outlet temperature of 100 deg C, and a flue gas water content of 14.5%.
  • the flue gas is cooled to about 100 deg C in the condenser, which is preferably implemented as a direct contact cooler where the flue gas flows over a packing in counter-current to circulating water.
  • This water captures the energy in the gas and is cooled In the heat exchanger 17 which receives cooling water from the desorber direct contact cooler, further heating this water and supplying more energy.
  • the dotted curve in figure 4 is for comparison only, showing one advantage with this system, over more traditional atmospheric CO2 capture systems where very little useful energy (energy above 100 deg C in this case) would be obtained from the same flue gas.
  • a third source of heat energy recovery is CO 2 compressor cooler(s) 48.
  • the amount of available energy in the compression cooler(s) is lower than in the coolers mentioned above but the temperature Is higher.
  • Table 1 illustrates the net power generated by the present power plant with CO 2 capture as a function of steam produced by means of the present heat regeneration in the flue gas direct contact cooler 15 (in the table identified by "Condenser”), in the desorber direct contact cooler section 66 (in the table Identified by “Desorber”, and the compressor intercooler(s) 48 (in the table identified by "Compressors”).
  • Table 1 clearly illustrates the increase in net power from the steam turbine as a result of increasing heat recovery from said three elements of the plant, and illustrates the most important advantages of the present invention.
  • the net power, steam turbine output minus flash compressor power, increases by more than 10 MW when 20 kg/s steam is produced and compressed by the invention and routed to the bottom of the desorber, replacing the same amount of 4 bara steam from the steam turbine.
  • This example illustrates the additional effect of the flashing and compression and injection of the steam from flash tank 81 Into the regenerator column as stripping gas, as illustrated with reference to figure 2 .
  • Figure 5 illustrates the vapour pressure of the lean absorbent as a function of temperature at about 100 deg C.
  • the heat capacity of the lean absorbent is about 3.0 kJ/kg-K
  • lean absorbent flow 1000 kg/s and cooling from about 112 deg C (the approximate temperature at the bottom of the desorber) to about 98.6 deg C (the approximate lean absorbent feed temperature to the top of the absorber)
  • about 1000 * 3.0 * (112 - 98.6) kW 40000 kW is produced
  • Table 2 summarizes the effect on flashing the lean absorbent on the total output from the steam turbine.
  • Table 2 Steam source Flash steam kg/s Flash steam latent heat MW Flash steam compress or MW 4 bara steam* kg/s Steam turb power MW Net power MW Steam turb 0 0 0 34 96 96 This 17.8 40 -3.0 ⁇ 1 120 115 Inv. Lean flash 17.8 40 -2.0 * Steam turbine side draw. With zero side draw, the steam turbine output is about 120 MW.
  • Table 2 clearly illustrates that the flash of the lean absorbent on the total output from the steam turbine, Combination of the energy features of example 1, the net power may be Increased from 96 MW to 115 MW compared to 120 MW without carbon capture.

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Claims (2)

  1. Procédé de production d'énergie par la combustion de combustibles carbonés et la capture de CO2, où le combustible carboné est brûlé dans une chambre de combustion (2) sous pression en présence de gaz contenant de l'oxygène, où le gaz de combustion est refroidi dans la chambre de combustion par la génération de vapeur à l'intérieur de tubes caloporteurs disposés dans la chambre de combustion, où le gaz d'échappement est retiré de la chambre de combustion par le biais d'un tuyau de gaz d'échappement (9) via un (des) échangeur(s) de chaleur (10) et d'unités de traitement de gaz d'échappement (11, 12), et un refroidisseur à contact direct (15) raccordé à un tuyau de recyclage d'eau (16) pour la recirculation d'eau collectée dans le fond du refroidisseur à contact direct et la réintroduction de l'eau dans le haut du refroidisseur, dans lequel refroidisseur le gaz d'échappement partiellement refroidi est encore refroidi et humidifié par un écoulement à contre-courant de l'eau, où le gaz d'échappement est retiré du refroidisseur à contact direct dans un tuyau d'échappement nettoyé (18) et est introduit dans un absorbeur de CO2 (19), dans lequel absorbeur un absorbant pauvre est introduit au-dessus d'une zone de contact supérieure (19''') dans l'absorbeur, pour amener le gaz d'échappement à s'écouler à contre-courant d'un absorbant de CO2 liquide afin de donner un absorbant riche qui est collecté dans le fond de l'absorbeur de CO2 et en est retiré dans un tuyau d'absorbant riche (30), et un gaz d'échappement pauvre en CO2 qui est retiré du haut de l'absorbeur par le biais d'un tuyau d'échappement pauvre (20) raccordé à l'absorbeur (19), où le gaz d'échappement pauvre est lavé dans une section de lavage, chauffé dans un échangeur de chaleur et dilaté sur une turbine pour la génération d'énergie électrique avant d'être relâché dans l'atmosphère ; où le tuyau d'absorbant riche (30) est raccordé pour introduire l'absorbant riche dans une colonne d'épuisement (32) pour la régénération de l'absorbant afin de donner un absorbant pauvre qui est retiré par le biais d'une conduite de recyclage d'absorbant pauvre (35) dans laquelle l'absorbant pauvre est repompé dans l'absorbeur (19), et un flux de CO2 qui est en outre traité pour donner du CO2 propre ; où le flux de CO2 est refroidi contre un fluide de refroidissement s'écoulant dans le refroidisseur à contact direct (66) situé dans le haut de la colonne d'épuisement (32) ; et où de l'eau est collectée au niveau d'une plaque collectrice (65) située sous le refroidisseur à contact direct (66), et où une conduite de recyclage d'eau (70) est agencée pour retirer l'eau collectée, caractérisé en ce que l'eau de refroidissement de refroidisseur à contact direct en circulation dans le tuyau de recirculation (16) est refroidie dans un échangeur de chaleur (17) situé dans le tuyau de recirculation (16), où l'eau de refroidissement est apportée et retirée, respectivement, par le biais de tuyaux de recyclage d'eau (70, 70') raccordés à l'échangeur de chaleur (17), et où l'eau retirée de l'échangeur de chaleur (17) par le biais de la conduite de recyclage (70') est détendue sur une vanne de détente (73) et un réservoir de détente (74), où l'eau provenant du réservoir de détente (74) est retirée par le biais d'une conduite (78) afin de recycler l'eau en tant que liquide de lavage dans le refroidisseur à contact direct à colonne d'épuisement (66) ; et où la vapeur dans le réservoir d'épuisement est introduite en tant que vapeur d'épuisement supplémentaire dans la colonne d'épuisement par le biais d'une conduite de vapeur (77) raccordée au réservoir de détente (74).
  2. Procédé selon la revendication 1, dans lequel le fluide dans le tuyau (70') est chauffé dans un échangeur de chaleur (48) situé pour refroidir le CO2 comprimé et la vapeur, avant l'introduction du fluide dans le tuyau (70') détendu sur la vanne de détente (73).
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KR102576196B1 (ko) * 2015-10-28 2023-09-07 한화오션 주식회사 이산화탄소 처리 시스템 및 이산화탄소 연소 반응기
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NO333145B1 (no) 2013-03-18
LT2643559T (lt) 2018-06-25
NO2643559T3 (fr) 2018-06-02
WO2012055715A2 (fr) 2012-05-03
WO2012055715A3 (fr) 2012-06-28
ES2661688T3 (es) 2018-04-03
CA2816412C (fr) 2018-07-24
PL2643559T3 (pl) 2018-07-31
US8887510B2 (en) 2014-11-18
AU2011322820B2 (en) 2016-03-03
HK1183925A1 (zh) 2014-01-10
CN103270253B (zh) 2015-11-25
EP2643559A2 (fr) 2013-10-02
AU2011322820A1 (en) 2013-06-13
CA2816412A1 (fr) 2012-05-03
JP5964842B2 (ja) 2016-08-03
NO20101517A1 (no) 2012-04-30
RU2013124398A (ru) 2014-12-10
JP2013543100A (ja) 2013-11-28
KR20120044869A (ko) 2012-05-08
CN103270253A (zh) 2013-08-28

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